Vulnerability in Oracle Database Server's RDBMS Component Exposes to Exploits
CVE-2026-91499

8.8HIGH

Key Information:

Vendor

Oracle
Status
Oracle Database Server
Vendor
CVE Published:
20 October 2026

What is CVE-2026-91499?

A vulnerability exists within the RDBMS component of Oracle Database Server, affecting versions 23.4.0 to 23.26.3. This security flaw allows a low-privileged attacker with the DBMS_VECTOR privilege and network access through Oracle Net to exploit the RDBMS. Successful exploitation may lead to complete control over the database system, posing significant risks to data confidentiality, integrity, and availability. Organizations using affected versions are encouraged to apply the latest security patches to mitigate this risk.

Affected Version(s)

Oracle Database Server 23.4.0 <= 23.26.3

References

https://www.oracle.com/security-alerts/cpuoct2026.html
vendor-advisory

CVSS V3.1

Score:
8.8
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.